Andrew was making a science project for school. He worked for 6.6 hours the first week, 2.75 hours the second week, and 4.4 hours the third week. Andrew used the following mental math strategy to find the total number of hours he worked on his project. 6 . 6 + 2 . 75 + 4 . 4 6.6+2.75+4.4 ( 6 . 6 + 4 . 4 ) + 2 . 75 6.6+4.4+2.75 11 + 2 . 75 = 13 . 75 11+2.75=13.75 What is the reason for his strategy? A. It is easier to add decimals in a decreasing order than in a mixed order. B. 6.6 and 4.4 are compatible numbers that are easy to add mentally. C. It is easier to add decimals with the same number of place values after the decimal point than adding decimals with different numbers of place values after the decimal point.. D. Rounding removes the decimals and creates whole numbers.

Ascientist studied a population of workers to determine whether verbal praise and/or tangible rewards affect employee productivity. in the study, some workers were offered verbal praise, some were offered tangible rewards (gift cards, presents, and some were offered neither. the productivity of each participant was measured throughout the study by recording the number of daily tasks completed by each employee. which inference might the scientists make based on the given information? a.) the number of daily tasks completed by each employee may influence the dependent variable, which is whether the employee receives verbal praise, tangible rewards, or neither. b.) verbal praise and/or tangible rewards may influence the independent variable, which is the number of daily tasks completed by each employee. c.) verbal praise and/or tangible rewards may influence the dependent variable, which is the number of daily tasks completed by each employee. d.) the dependent variables, which are verbal praise and tangible rewards, may influence the number of daily tasks completed by each employee.